Drafting instrument



Jan. 4, 1949. J, MORAN 2,458,188

DRAFTING INSTRUMENT Filed May l5,A 1946 Wm A 26 32 INVENToR. JOSEPHMORAN le BY TTORNEY Patented Jan. 4, 1949 uul'rlen eat,

reassess 'DRAFTING msifnuMENfr JosepliiMoramJkcagoflll. ApplieaumMay-is,1946, srialinnfissasos fz (or. sexta) i i The present invention relates.to draftingin- .therethzfu'gmhmichfis'rovided-:atone extremitystruments, and more particularly to improve- 'wlhvaa'tlla'mpng 'iscTS.ments therein. v'In' 'usefthemember II "is ,se cured'toal'sitable It isoften necessaryrin drafting to draw 'lines fdraftiiig ltablfe" `y,,pbitionin''g "'th'e base i I3 over or do lettering at various angles oratvarious' 5 ftneftop"thereofuntil thexzblock 11i 'Seng''aefesthepositions on the sheet on which the work "is being e'dgetherofaridthentighterngthebolt f8"the done. The usual method 'for such :operations`disc:'I9*engagingthe nrrdersidebfthetabl'e. `It is to utilize aT-square and triangles,'whichper is obvious that the device"ma y r'beclamped 'to form suitably under many conditions. "However, differenttableslofdifferent "tlrieknesses' and iat such implements are not'satisfactory for opera-M10 any V4s`u'itaril'e"position'onifihetallations at varied angles, or where itisdesirableto .A, straight-edge. 2lis securedi'torthameni-ber clamp the instruments '1in a'certain'rposition'lor LIl bysecuring means.inicatedgenerallyas .22.repeated operations. The" sepurmgtmean'sin 'dnclueafplate '123 "whichAccordingly, an object "of 4the 'presen-t invenis "secured by screws to'a'ifbloc'k' 2:6 "located any angle or at any position "on "the sheetion'2'3eissufolently'Wideto'eitend*across-thezslot'iIZ which work is .beingdone. andoverthe-"meniber ITI thus preeluding'the A second obj ect ofthe invention is to provide "block2liandplate2'3"ffromipassingidownwardly suitable clamping means forinsuring repeated throughrthesldtl.

operation at the same angle or position. zo platelTLs'nnilar A.insnretothe' plate 23, 'is

rThe -device embodyingiiilfieinventionfcomprises, positioned underthemember "-11 iand `in alignin general, a member for secull'enenttoaldraftment with .the plate' 23. ""Thetwo plates lare ing table, astraight-edge, means -for securing fsecured*together-bythe screws 24.

the straight-edge to the member in such a man-Abrolt'thavingffaflargeilcrrurledih'eadpasses ner as to allow it to besecured at any 'position 25 through an l[opening .iinithe top 'fpla'teU23, is

straight-edge which rmay be secured torth'ehst fthrough--fanvinnen-lngiin plate-i231. VAThe straight-edge'perpendicularlyuthereto,when detbolft 728ist'prot/"ided wit'hfa tappeddentralppening sired. inthe bottom thereof, the threads" 'lng opposite Ajbe'tterunderstandingcio'ffthe devicemaybem .to those -onthe bolt.A that is,-i"fthe boltisffprohad bythe following-detailed"descriptionthereoi*slided"withri-gliti-lianilthreafds'- those-'effthe openwhen read inconjunction with the accompanying ing are of the left-hand variety.drawing, in which The tapped opening in the bolt 28 receives a Figure lis a perspective View of an apparatus set screw 29 which is threadedthrough the embodied in the invention; 35 straight-edge 2l, the underside of the straight- Figure 2 is an enlarged sectional view taken onedge lbeing-counterbored to receive the head the line 2-2 of Figure 1;of the set screw.

Figure 3 is an enlarged sectional view taken on FY-Om the abovedeSOIiDtOn it may be Seen that the line 3 3 of Figure l; and inasmuch asthe set screw 29 secures the straight F' ure4 is an enlar ed sectionalView taken on 40 edge 2| t0 the bolt 23- and as the bolt 28 is thelfne 44 of Fgur 1 threaded through the block 2s, the plate 21 wm Referring nowto Figure 1, it may be geen that be held between the straight-edge 2Iand the a two barred longitudinal member I I is provided, block 26' Y rin th bolt 28, and which has a central longitudinal slot I2 extend- 45beugcunggus(hwbo nis of an opp0 ing almost the enme length thereof' Atone site thread, such will not result in loosening of extremity of themember Il a short flat base lI3 the screw 29 the Straight edge 2|becoming is Secured by means of screws M or other 5mt loosened withrespect to the remainder of the able meansassembly, thereby allowing itto be positioned at By reference to Figure 4 it may be seen that 50 anyangle with respect 1-,0 the plate 21 and thus two of the screws I4 areShort, passing through with respect to the member Il. Thereafter the themember II and the base I3 only, whereas the bolt 28 w11 be tightened`with the straight edge other tWO SCI'BWS IMSS through 9 block l5 and 2|beine,r held by the described assembly in such thread into another flatbase I'l. The base I1 is angular position. provided with a large-headedbolt I8 threaded 55 A second top plate 3l is provided, adjacent the eachother. edge 33 is not in use' the bolt 31 .may be removed 3 plate 23,which is also of su'lcent width to extend over the slot I2 and memberIl. The plate 3| is provided with an opening through which extends alarge headed bolt 32 which is threaded into the block 26. By tightening`the bolt 32 the plate 3| will be clamped against the member andpreclude movement of the block 26 in the slot I2. However, by looseningthe bolt 32 the entire assembly may be moved Within the slot |2 toanyposition with respect .to the member| l, at whichtimeJthe bolt 32will be tightened again.

Therefore, from the above description it may antenas be seen that thestraight-edge 2| may be secured f at any angle with respect to themember and may then be moved to any positionk alongthe ber having alongitudinally extending central slot, means secured to said member forsecuring said member to a drafting table, a straight-edge, a blockpositioned in the slot in said member, an upper plate secured to saidblock and extending over the slot and said member, a bolt passingthrough said upper plate and threadably engaging said block, said boltbeing provided with a tapped central opening, a screw threadably ensaidbolt, and va lower plate positioned between gaging said straight-edge.and the opening in said block and said straight-edge, whereby the'recited elements operate to permit said straightedge torbe positionedat any angle with respect length of the member Il and be secured in thatposition all while retaining the previously set angular relationshipwith thefmember I I.

With reference to Figure 1 again, it may be seen that a secondstraight-edge 33 is optionally provided. The straight edge 33 has aplate 34,

bifurcated et 3s, extending 'sidewar'diy therefrom approximatelymidwayof its length. The

I plate 34 `is secured. to the straight-edge '33 by any suitable means,such asv the illustrated screw.

Referring now to Figure 3, it may bevseen that a knurled headed bolt 31.passes through the bifurcated portion 36 vof the plate 33 and threadsinto. the straight-edge 2|, the plate 34 and shoulder portion. of thebolt 31 being separated by awasher 38. y

When it is desired to use the straight-edge 33 the bolt 31`maybeloosened, if in the straightedge 2|,. the bifurcated portion 36 of theplate 34positioned encompassing the bolt 31 under the,

washer 38, and the bolt 31 tightened. By placing. the straight-edge 33in engagement with the extremityof the straight-edge 2| it will insurethe members being perpendicular with respect to It is obvious that whenthe straighthas beenrdescribed it is-illustrative only, merely being anembodiment within the scopeand spirit Vof lthe invention.

what is eieimed isz' 1. A drafting instrument comprising a memto saidmember.

2..A drafting instrument comprising a member having a longitudinallyextending central slot, means securedto said member for securing saidmember to a drafting table, a straight-edge,

a block positioned in the slot insaid member, anupper .plate secured tosaid block and extending over the slot and said member, a bolt passingthrough said upper plate and threadablywengaging said block, said boltbeing provided with a tapped central opening, a screw threadablyengaging said straight-edge and the opening in said bolt, and alowerplate positioned between said block and said straight-edge, whereby theArecited elements operate to permit said straightedge to be positionedvas an angle with respect to said member, a second upper plate extendingover the slot and said member, and a bolt passing through said secondupper plate and threadably engaging said block, whereby said second,upper plate and said bolt operate to permit said straight-edge to bepositioned at any point in theslot in said member.

l JOSEPH MORAN.

REFERENCES CITED .-The following references are of record in the vle'ofthis patent:A

UNITED STATES PATENTS vNumber Y Name Date 530,741 Altpeter Dec. 11, 18941,346,409 Lucas July 13, 1920 FOREIGN PATENTS y Number I -Country DateGreat Britain Oct. 28, 1922

